1. Department of Neurology; Catholic University; Milan Italy
2. Department of Neurology; Carlo Besta National Neurological Institute; Milan Italy
3. Sobell Department of Motor Neuroscience and Movement Disorders; Institute of Neurology; University College London (UCL); London United Kingdom
4. Departments of Neurology; Beth Israel Medical Center and Albert Einstein College of Medicine, New York, New York and Bronx; New York USA
5. Department of Neurology; Emory University; Atlanta Georgia USA
6. Department of Neurology; Columbia University, New York; New York USA
7. Movement Disorders Unit, Department of Neurology, Westmead Hospital and Sydney Medical School; University of Sydney; Sydney Australia
8. Human Motor Control Section; National Institute of Neurological Disorders and Stroke; National Institutes of Health; Bethesda Maryland USA
9. Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology; Baylor College of Medicine; Houston Texas USA
10. Departments of Neurology, Human Genetics and Pediatrics; Emory University; Atlanta Georgia USA
11. Section of Clinical and Molecular Neurogenetics at the Department of Neurology; University of Lübeck; Lübeck Germany
12. Morton and Gloria Shulman Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease; Toronto Western Hospital and the University of Toronto; Toronto Canada
13. Departments of Neurology, Neurobiology, and Anatomy, Brain and Cognitive Sciences, and Pediatrics; University of Rochester; Rochester, New York USA
14. Dystonia Medical Research Foundation; Chicago Illinois USA